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You searched for: subject:"particulates"
[audio]The EPA, Ozone, Particulates, and the Scientific Method. Bonner Cohen, Ph.D. - Doctors for Disaster Preparedness
Dr. Cohen is Editor of EPA Watch. Doctors for Disaster Preparedness 16th Annual Meeting - 1998 Scottsdale, AZ
Keywords: bonner cohen; epa; ozone; particulates; scientific method
Downloads: 34
[texts]World Trade Center Dust Particles and What We Know
Presentation regarding the world trade center particulates and the diseases which may result.
Keywords: world trade center; dust; particulates; 9/11
Downloads: 106
[texts]Data Mining SIAM Presentation - Srivastava, Ashok
This viewgraph document describes the data mining system developed at NASA Ames. Many NASA programs have large numbers (and types) of problem reports.These free text reports are written by a number of different people, thus the emphasis and wording vary considerably With so much data to sift through, analysts (subject experts) need help identifying any possible safety issues or concerns and help them confirm that they haven't missed important problems...
Keywords: PARTICULATES; SUSPENSIONS; FRACTIONATION; ELECTROPHORESIS; ELECTRIC FIELDS; DEPOSITION; DIELECTRICS; PATENTS
Downloads: 135
[texts]The Effect of Vacuum Carbonization of Waste Maize Stalk on the Thermal Resistance of Polyester/Maize Stalk Particulate Composites
The effect of vacuum carbonization of waste maize stalk on the thermal resistance of polyester/maize stalk particulate composites has been investigated. Maize stalk was carbonized at a temperature of 1200oC to convert the biomass into biocarbon; then the carbonized maize stalk was used to reinforce polyester while the uncarbonized ones served as the control. The carbonized maize stalk particulates (CMSp) were added with different volume fractions into a polyester matrix at an interval of 2, 4, 6...
Keywords: Carbonized Maize Stalk Particulates; Polyester Resin; Thermal Resistance; Thermal Degradation
Downloads: 11
[texts]Investigation of the Relationship between Diesel Fuel Properties and Emissions from Engines with Fuzzy Linear Regression
Selecting the fuel properties as the independent variables,and the emissions from engines as the dependent variables,the fuzzy linear regression equations are constructed in thispaper with the fuzzy linear regression; as well as thesimulation and prediction results calculated with theequations are analyzed. Satisfactory results are achieved byselecting an appropriate degree of membership. The effect ofthe degree of the membership on the fuzzy regressioncoefficients is also analyzed...
Keywords: Emissions from Engines; Fuel Properties; Fuzzy Linear Regression; Particulates
Downloads: 10
[texts]Uncertainty in Computational Aerodynamics - Luckring, J. M.
An approach is presented to treat computational aerodynamics as a process, subject to the fundamental quality assurance principles of process control and process improvement. We consider several aspects affecting uncertainty for the computational aerodynamic process and present a set of stages to determine the level of management required to meet risk assumptions desired by the customer of the predictions.
Keywords: HYPERVELOCITY IMPACT; SPACE DEBRIS; METEOROID HAZARDS; MICROMETEOROIDS; EARTH ORBITAL ENVIRONMENTS; CONTAMINATION; HYDRODYNAMICS; PARTICULATES; DATA BASES
Downloads: 136
[texts]Development of Fuzzy Logic and Soft Computing Methodologies - Zadeh, L. A.
Our earlier research on computing with words (CW) has led to a new direction in fuzzy logic which points to a major enlargement of the role of natural languages in information processing, decision analysis and control. This direction is based on the methodology of computing with words and embodies a new theory which is referred to as the computational theory of perceptions (CTP). An important feature of this theory is that it can be added to any existing theory - especially to probability theory...
Keywords: ENCAPSULATING; FLAMES; MONTE CARLO METHOD; PARTICULATES; COMBUSTION SYNTHESIS; FLAME TEMPERATURE; HIGH TEMPERATURE ENVIRONMENTS; MORPHOLOGY; PYROLYSIS
Downloads: 186
[texts]Effects of Neutral Density on Energetic Ions Produced Near High-Current Hollow Cathodes - Kameyama, Ikuy
Energy distributions of ion current from high-current, xenon hollow cathodes, which are essential information to understand erosion phenomena observed in high-power ion thrusters, were obtained using an electrostatic energy analyzer (ESA). The effects of ambient pressure and external flow rate introduced immediately downstream of hollow cathode on ion currents with energies greater than that associated with the cathode-to-anode potential difference were investigated...
Keywords: AIR POLLUTION; CARBON MONOXIDE; SULFUR DIOXIDES; NITROGEN DIOXIDE; AIR QUALITY; GAS COMPOSITION; PREVENTION; PARTICULATES; OZONE
Downloads: 84
[texts]Reanalysis of Clementine Bistatic Radar Data from the Lunar South Pole - Simpson, Richard A.
On 9 April 1994 the Clementine spacecraft high-gain antenna was aimed toward the Moon's surface and the resulting 13-cm wavelength radio echoes were received on Earth. Using these data, we have found that the lunar surface generally follows a Lambertian bistatic scattering function sigma(sub 0) = K(sub D)cos(theta(sub i) with K(sub D) approx. 0.003 for the opposite (expected) sense of circular polarization and K(sub D) approx...
Keywords: LUBRICATION; PATENTS; CRYOGENIC TEMPERATURE; CHROMIUM OXIDES; SILICON CARBIDES; PLASMAS (PHYSICS); COMPOSITE MATERIALS; PARTICULATES; LOW TEMPERATURE; FLUORIDES
Downloads: 71
[texts]Monte Carlo Shower Counter Studies - Snyder, H. Davi
Activities and accomplishments related to the Monte Carlo shower counter studies are summarized. A tape of the VMS version of the GEANT software was obtained and installed on the central computer at Gallaudet University. Due to difficulties encountered in updating this VMS version, a decision was made to switch to the UNIX version of the package. This version was installed and used to generate the set of data files currently accessed by various analysis programs...
Keywords: INTERPLANETARY DUST; SENSITIVITY; MANUFACTURING; MASS DISTRIBUTION; PARTICULATES; PLANETARY ATMOSPHERES; PROTOTYPES; DYNAMIC RANGE; FEEDBACK CONTROL; OPTICAL MEASUREMENT
Downloads: 183
[texts]An Exploratory Study of Cost Engineering in Axiomatic Design: Creation of the Cost Model Based on an FR-DP Map - Lee, Taesik
Large complex projects cost large sums of money throughout their life cycle for a variety of reasons and causes. For such large programs, the credible estimation of the project cost, a quick assessment of the cost of making changes, and the management of the project budget with effective cost reduction determine the viability of the project. Cost engineering that deals with these issues requires a rigorous method and systematic processes...
Keywords: MICROELECTROMECHANICAL SYSTEMS; PACKAGING; SATELLITES; TEMPERATURE CONTROL; LAUNCHING; CONTROL EQUIPMENT; PARTICULATES; PROTECTION
Downloads: 89
[texts]Analysis of Mauna Kea Imaging of Comet Shoemaker-Levy 9 - Jewitt, Davi
The aim of this proposal was to analyse a set of charge-coupled device images of the Jupiter-impacting comet D/Shoemaker-Levy 9. The images were obtained primarily using the University of Hawaii 2.2-m telescope and a standardized imaging device, providing an unusually uniform set of data. Additional data included a set of spectra taken in search of gaseous emission from SL9 using the UH 2.2-m and Keck 10-m telescopes.
Keywords: ANNUAL VARIATIONS; CARBON; PARTICULATES; SARGASSO SEA; DIFFUSION; ADVECTION; ESTIMATES; OXYGEN; THERMOCLINES
Downloads: 60
[texts]Investigation of the effect of inlet turbulence length scale on fan discrete tone noise - Hodder, B. K
Results of an experimental investigation at the Ames 40- by 80-Foot Wind Tunnel of fan rotor alone discrete tone noise is presented. The investigation examines rotor interaction with fan inlet turbulence. The importance of turbulence length scale is shown by comparing the fan radiated acoustic spectrum with and without modified turbulence length scales. A small-scale low pressure ratio fan was used for the experiment.
Keywords: COSMIC PLASMA; PARTICLES; SPACE SHUTTLES; SPACECRAFT CONTAMINATION; COSMIC DUST; EXPERIMENT DESIGN; PARTICULATES; SPACE DEBRIS
Downloads: 116
[texts]Space station Simulation Computer System (SCS) study for NASA/MSFC. Volume 1: Overview and summary - NON
NASA's Space Station Freedom Program (SSFP) planning efforts have identified a need for a payload training simulator system to serve as both a training facility and as a demonstrator to validate operational concepts. The envisioned Marshall Space Flight Center (MSFC) Payload Training Complex (PTC) required to meet this need will train the space station payload scientists, station scientists, and ground controllers to operate the wide variety of experiments that will be onboard the Space Station ...
Keywords: CONTAMINANTS; FLUOROCARBONS; GREASES; HYDROCARBONS; OILS; PARTICULATES; PLASTICIZERS; SILICONES; CONTAMINATION; ENGINE PARTS; INSPECTION; SPACE SHUTTLE BOOSTERS; SURFACE REACTIONS; CLEANLINESS; DIRT; DUST
Downloads: 83
[texts][MODIS Investigation] - Abbott, Mark R
We are responsible for the delivery of two at-launch products for AM-1: Fluorescence line height (FLH) and chlorophyll fluorescence efficiency (CFE). In our last report we had planned to combine the two separate algorithms into a single piece of code. However, after discussions with Bob Evans, it was decided that it was best to leave the two algorithms separate. They have been integrated into the MOCEAN processing system, and given their low computational requirements, it easier to keep them sep...
Keywords: INSULIN; LOSSES; INJECTION; DISSOCIATION; CYCLIC ATROPHY; ANIMALS; METABOLIC DISEASES; SENSITIVITY; CARBOHYDRATE METABOLISM; ADRENERGICS; SYMPATHETIC NERVOUS SYSTEM; RATS; PARTICULATES; MUSCLES
Downloads: 41
[texts]More on Magnetic Spectra from Correlated Crustal Sources on Mars - Voorhies, C. V
The spectral method for distinguishing crustal from core-source magnetic fields has been re-examined, modified and applied to both a comprehensive geomagnetic field model and an altitude normalized magnetic map of Mars. These observational spectra are fairly fitted by theoretical forms expected from certain elementary classes of magnetic sources. For Earth we found fields from a core of radius 3512 plus or minus 64 km, in accord with the 3480 km seismologic radius, and a crust represented by a s...
Keywords: GENESIS MISSION; IMPACT DAMAGE; ANALOGS; REMOVAL; PARTICULATES; DUST; LASER ABLATION; CLEANING; DECONTAMINATION; IMPACT; ACCIDENTS; ACCUMULATORS; SAMPLERS; CONTAMINANTS; SAMPLE RETURN MISSIONS
Downloads: 67
[texts]Optical photometry of the 1982-1984 eclipse of Epsilon Aurigae - Hopkins, J. L
From slightly before the 1982-1984 eclipse of Epsilon Aurigae to the present observers from around the world have been making photoelectric photometry observations of this star system. Over 2000 UBV observations have been reported as well as observations in the R, I, J, H, K, L, M, N, and Q bandpasses plus the y, b, v, and u bandpasses. Twenty nine observers from 9 countries submitted photometry data to the campaign...
Keywords: FLOW VISUALIZATION; LASER APPLICATIONS; TWO DIMENSIONAL FLOW; WATER TUNNEL TESTS; FLOW DISTRIBUTION; FLUORESCENCE; LASER OUTPUTS; PARTICULATES; PHOTOGRAPHY
Downloads: 78
[texts]The Octavolateralis System and Mauthner Cell: Interactions and Questions - Eaton, Robert C.
This paper is an overview of some of the major points to arise in the accompanying contributions of this special symposium issue. The symposium papers arose out of discussions among investigators interested in the inner ear and Mauthner cell, with the focus on hydrodynamic components that activate the Mauthner cell through the octavolateralis system. The intention of the symposium was to investigate the possibility of using our knowledge of the Mauthner system to help understand acoustic process...
Keywords: REMOTE SENSING; INFRARED RADIOMETERS; CALCIUM CARBONATES; ALTIMETRY; ARCHIPELAGOES; GEOCHEMISTRY; SCATTEROMETERS; SATELLITE OBSERVATION; OCEANOGRAPHY; PREDICTIONS; PELAGIC ZONE; PARTICULATES
Downloads: 106
[texts]Global Precipitation Measurement: GPM Microwave Imager (GMI) Algorithm Development Approach - Stocker, Erich Fran
This slide presentation reviews the approach to the development of the Global Precipitation Measurement algorithm. This presentation includes information about the responsibilities for the development of the algorithm, and the calibration. Also included is information about the orbit, and the sun angle. The test of the algorithm code will be done with synthetic data generated from the Precipitation Processing System (PPS).
Keywords: AEROSOLS; FARM CROPS; SENSITIVITY; PARTICULATES; AGRICULTURE; ATMOSPHERIC MODELS; AIR QUALITY; POLARIMETRY; IRRADIANCE; PHOTOSYNTHESIS; VEGETATION; CLIMATE CHANGE; METEOROLOGICAL PARAMETERS
Downloads: 201
[texts]INHABITED SPACE, PART 1 - NON
PRELIMINARY RESULTS ARE PRESENTED OF WORK ON PREBIOLOGY, EXOBIOLOGY, THE POSSIBILITY OF LIFE ON OTHER PLANETS, COSMIC INFLUENCES ON ANIMAL AND PLANT LIFE ON EARTH, PLANETARY CHEMISTRY, EXOBIOLOGY, AND THE PROBLEM OF DEFINING LIFE ON OTHER THAN A CARBON BASIS. THE AUTHORS ARE MOSTLY SOVIET, WITH SEVERAL WESTERN AND EUROPEAN AUTHORITIES INCLUDED, AS WELL AS SOME AMERICAN EXPERTS.
Keywords: AIR POLLUTION; NITRIC OXIDE; PARTICULATES; AIRPORT PLANNING; ENVIRONMENT MODELS; URBAN DEVELOPMENT; AEROSOLS; AIR TRAFFIC; ENVIRONMENT POLLUTION; EXHAUST GASES; JET AIRCRAFT
Downloads: 272
[texts]24. Eng Mechanical Madeva Nagaral - Madeva Nagaral, V Auradi & Ravishankar M K
Aluminium metal matrix composites (MMCs) have gained importance in various industries because of their good mechanical properties such as wear resistance, low density, high strength and good structural rigidity. Aluminium MMCs are preferred in the fields of aerospace, military, automotive, marine and in many other domestic applications. In this study, it is intended to develop and study the mechanical behaviour of Al6061/Al2O3/Graphite reinforced hybrid Aluminium metal matrix composites...
Keywords: 6061Al Alloy; Al2O3 and Graphite Particulates; Tensile Strength; Hardness; Hybrid Metal Matrix Composites; Stir-Casting
Downloads: 22
[texts]Gravity gradient preliminary investigations, part 2: Lunar tidal gravity gradients and stresses (exhibit C) - Houston, M. H.
Preliminary analysis of the gravity gradients associated with gravity tides on the moon caused by the earth indicates that the relative changes in the gradients are very irregular, and large, and about 15 times greater than those experienced on earth. Thus gradients, in preference to gravity tides themselves, may well be an important key in correlating tide effects with lunar transient events and moonquakes, and also in determining triggering mechanisms for crustal movement and faulting...
Keywords: AIR FILTERS; PARTICULATES; TRACE ELEMENTS; AIR POLLUTION; ANIONS; GAS CHROMATOGRAPHY; HIGH ALTITUDE; AIR SAMPLING; ATMOSPHERIC COMPOSITION; CHEMICAL ANALYSIS; CONTAMINATION
Downloads: 108
[texts]Advanced Power Regulator Developed for Spacecraft - NON
The majority of new satellites generate electrical power using photovoltaic solar arrays and store energy in batteries for use during eclipse periods. Careful regulation of battery charging during insolation can greatly increase the expected lifetime of the satellite. The battery charge regulator is usually custom designed for each satellite and its specific mission. Economic competition in the small satellite market requires battery charge regulators that are lightweight, efficient, inexpensive...
Keywords: AEROSOLS; PRESSURE RATIO; GROUND TESTS; SULFUR; STAINLESS STEELS; PRODUCT DEVELOPMENT; BOEING 757 AIRCRAFT; PARTICLE SIZE DISTRIBUTION; PLUMES; EXHAUST EMISSION; TRACE ELEMENTS; VOLATILITY; PARTICULATES; JP-5 JET FUEL
Downloads: 96
[texts]A Comparison of Two Path Planners for Planetary Rovers - Tarokh, M.
The paper presents two path planners suitable for planetary rovers. The first is based on fuzzy description of the terrain, and genetic algorithm to find a traversable path in a rugged terrain. The second planner uses a global optimization method with a cost function that is the path distance divided by the velocity limit obtained from the consideration of the rover static and dynamic stability. A description of both methods is provided, and the results of paths produced are given which show the...
Keywords: BIOMASS; LAGRANGIAN FUNCTION; PARTICULATES; REYNOLDS STRESS; VAPOR PHASES; MULTIPHASE FLOW; PYROLYSIS; TARS; TURBULENT FLOW; MATHEMATICAL MODELS; BEDS (PROCESS ENGINEERING); CHEMICAL REACTORS; CONSERVATION EQUATIONS
Downloads: 101
[texts]Computational methods for HSCT-inlet controls/CFD interdisciplinary research - Cole, Gary L.
A program aimed at facilitating the use of computational fluid dynamics (CFD) simulations by the controls discipline is presented. The objective is to reduce the development time and cost for propulsion system controls by using CFD simulations to obtain high-fidelity system models for control design and as numerical test beds for control system testing and validation. An interdisciplinary team has been formed to develop analytical and computational tools in three discipline areas: controls, CFD,...
Keywords: FERRIC IONS; HYDRATION; IRON; MONTMORILLONITE; OXIDES; PARTICULATES; SOIL MOISTURE; MARS ENVIRONMENT; MARS SURFACE; MOISTURE CONTENT; SOILS; SPECTRAL REFLECTANCE; SURFACE PROPERTIES; ABSORPTION; BIDIRECTIONAL REFLECTANCE
Downloads: 106
[texts]Congestion Avoidance Testbed Experiments - Denny, Barbara A.
DARTnet provides an excellent environment for executing networking experiments. Since the network is private and spans the continental United States, it gives researchers a great opportunity to test network behavior under controlled conditions. However, this opportunity is not available very often, and therefore a support environment for such testing is lacking. To help remedy this situation, part of SRI's effort in this project was devoted to advancing the state of the art in the techniques use...
Keywords: TROPOSPHERE; TRACE ELEMENTS; VOLCANOES; SULFUR DIOXIDES; PARTICULATES; CHEMICAL COMPOSITION; PACIFIC OCEAN; AEROSOLS; MARINE METEOROLOGY; OCEAN SURFACE; PHOTOCHEMICAL REACTIONS; AIR WATER INTERACTIONS; MIXING RATIOS
Downloads: 83
[texts]TOPEX SDR Processing, October 1998 - Lee, Jeffrey E.
This document is a compendium of the WFF TOPEX Software Development Team's knowledge regarding Sensor Data Record (SDR) Processing. It includes many elements of a requirements document, a software specification document, a software design document, and a user's manual. In the more technical sections, this document assumes the reader is familiar with TOPEX and instrument files.
Keywords: ECOSYSTEMS; PARTICULATES; RIVERS; SALINITY; PIGMENTS; UPWELLING WATER; REPUBLIC OF SOUTH AFRICA; REMOTE SENSING; OCEANOGRAPHY; SEA-VIEWING WIDE FIELD-OF-VIEW SENSOR; FISHERIES; MODIS (RADIOMETRY); PHYTOPLANKTON
Downloads: 118
[texts]In-Situ Polymerized PLOT Columns 3: Divinylbenzene Copolymers and Dimethacrylate Homopolymers - Shen, Thomas C.
Studies of divinylbenzene copolymers and dimethacrylate homopolymers indicate that the polymer pore size controls the separation of water and ammonia on porous-layer-open-tubular (PLOT) columns. To a lesser degree, the polarity of the polymers also affects the separation of a water-ammonia gas mixture. Our results demonstrate that the pore size can be regulated by controlling the cross-linking density or the chain length between the cross-linking functional groups...
Keywords: TURBULENCE MODELS; PARTICULATES; SPHERES; BOUNDARY CONDITIONS; REYNOLDS EQUATION; MULTIPHASE FLOW; PROTOPLANETS; NEBULAE; PARTICLE SIZE DISTRIBUTION; MATHEMATICAL MODELS; COMPUTATIONAL FLUID DYNAMICS; GRAVITATION; CONVECTION
Downloads: 199
[texts]Algorithms for Ocean Bottom Albedo Determination from In-Water Natural Light Measurements - Leathers, Robert A.
A method for determining ocean bottom optical albedo, R-sub b, from in-water upward and downward irradiance measurements at a shallow site is presented, tested, and compared with a more familiar approach that requires additional measurements at a nearby deep-water site. Also presented are two new algorithms for the estimation of R-sub b from measurements of the downward irradiance and vertically upward radiance.
Keywords: OCEANOGRAPHY; BACKSCATTERING; IN SITU MEASUREMENT; DATA PROCESSING; WATER COLOR; PERTURBATION; RADIOMETERS; SEA-VIEWING WIDE FIELD-OF-VIEW SENSOR; SEA WATER; ADRIATIC SEA; ATMOSPHERIC MODELS; HYDROLOGY; PARTICULATES
Downloads: 89
[texts]Collaborating for the Future: Public Use of Earth and Space Science Data Over the Internet - Remote Sensing Public Access Center (RSPAC) - Kakadelis, Stratis M
This document chronicles the achievements of NASA's Remote Sensing Public Access Center (RSPAC) for the reporting period of August 1996 through July 1997. BDM International, which operates RSPAC, is contractually required to produce this report. RSPAC provides technical and programmatic to all IITA projects. This includes services which range from making experts available to answer questions to direct computer and technology support...
Keywords: LAUNCHING; SOILS; SEDIMENTS; PH; PARTICULATES; ORGANISMS; OCEAN BOTTOM; NEAR FIELDS; EXHAUST GASES; CLOUDS; ENVIRONMENT EFFECTS; DEPOSITION; HYDROGEN CHLORIDES; DEBRIS; ALUMINUM OXIDES; WASHING; SURFACE WATER; SPACE SHUTTLES
Downloads: 96
[texts]A method for obtaining practical flutter-suppression control laws using results of optimal control theory - Newson, J. R
The results of optimal control theory are used to synthesize a feedback filter. The feedback filter is used to force the output of the filtered frequency response to match that of a desired optimal frequency response over a finite frequency range. This matching is accomplished by employing a nonlinear programing algorithm to search for the coefficients of the feedback filter that minimize the error between the optimal frequency response and the filtered frequency response...
Keywords: CLEAN ROOMS; INSPECTION; LIGHT SCATTERING; PARTICULATES; SPACECRAFT ENVIRONMENTS; PARTICULATE SAMPLING; POLLUTION CONTROL; SPACECRAFT CONTAMINATION; VIKING SPACECRAFT; VOYAGER PROJECT; AIR QUALITY; CLOTHING; CONTROLLED ATMOSPHERES
Downloads: 109
[texts]Formal Analysis of Human Automation Interaction: The Problem of Display Correctness - Degani, Asaf
This presentation attempted to develop a quantitative method for evaluating the effectiveness of autoflight displays. Researchers sought to develop a methodology for evaluation of display correctness and develop a methodology for display synthesis. Topics covered included: mode awareness, industry/research contributions, human-machine interface analysis, research objectives, modeling, flight guidance project and evaluation.
Keywords: CERAMIC MATRIX COMPOSITES; THERMAL CYCLING TESTS; SOLID OXIDE FUEL CELLS; PARTICULATES; MODULUS OF ELASTICITY; HOT PRESSING; FLEXING; DEGRADATION; ZIRCONIUM OXIDES; ALUMINUM OXIDES; FRACTURE STRENGTH; CERAMICS; MECHANICAL PROPERTIES; ELECTROLYTES; FABRICATION; YTTRIA-STABILIZED ZIRCONIA
Downloads: 73
[texts]The Observed Galactic Annihilation Line: Possible Signature of Accreting Small Mass Black Holes in the Galactic Center - Titarchuk, Lev
Various balloon and satellite observatories have revealed what appears to be an extended source of 0.511 MeV annihilation radiation with flux of approx. 10(exp -3) photons/sq cm/s centered on the Galactic Center. Positrons from radioactive products of stellar explosions can account for a significant fraction of the emission. We discuss an additional source for this emission: namely e()e(-) pairs produced when X-rays generated from the approx...
Keywords: SCIENCE; AIR QUALITY; ENVIRONMENT EFFECTS; EARTH ATMOSPHERE; CARBON DIOXIDE; PARTICULATES; HYDROCARBONS; CARBON MONOXIDE; OZONE; AIRCRAFT ENGINES; AIRPORTS; TECHNOLOGIES; EARTH ENVIRONMENT; EXHAUST EMISSION; GENERAL OVERVIEWS; CIVIL AVIATION; CLIMATE CHANGE; CLIMATOLOGY; POLICIES
Downloads: 74
[texts]Optic Flow Dominates Visual Scene Polarity in Causing Adaptive Modification of Locomotor Trajectory - Nomura, Y.
Locomotion and posture are influenced and controlled by vestibular, visual and somatosensory information. Optic flow and scene polarity are two characteristics of a visual scene that have been identified as being critical in how they affect perceived body orientation and self-motion. The goal of this study was to determine the role of optic flow and visual scene polarity on adaptive modification in locomotor trajectory...
Keywords: AEROSOLS; ZEOLITES; CRACKING (CHEMICAL ENGINEERING); OPTICAL EMISSION SPECTROSCOPY; PARTICULATES; FLUIDIZED BED PROCESSORS; INDUSTRIAL AREAS; HIGH PRESSURE; HIGH TEMPERATURE; NEUTRON ACTIVATION ANALYSIS; EXTRACTION; INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY; MICROWAVES; RARE EARTH ELEMENTS; REFINING; CATALYSTS; AMBIENT TEMPERATURE; ACIDS
Downloads: 59
[texts]Scalable Hierarchical Network Management System for Displaying Network Information in Three Dimensions - NON
A network management system has SNMP agents distributed at one or more sites, an input output module at each site, and a server module located at a selected site for communicating with input output modules, each of which is configured for both SNMP and HNMP communications. The server module is configured exclusively for HNMP communications, and it communicates with each input output module according to the HNMP...
Keywords: SILICON CARBIDES; LOW TEMPERATURE; OXIDATION RESISTANCE; REFRACTORY MATERIALS; TOUGHNESS; THERMAL CONDUCTIVITY; PARTICULATES; SILICON NITRIDES; THERMAL CYCLING TESTS; HYBRID COMPOSITES; CREEP STRENGTH; CERAMIC MATRIX COMPOSITES; HEAT RESISTANT ALLOYS; MOLYBDENUM COMPOUNDS; SILICIDES
Downloads: 108
[texts]A Passive Earth-Entry Capsule for Mars Sample Return - Mitcheltree, R. A.
A combination of aerodynamic analysis and testing, aerothermodynamic analysis, structural analysis and testing, impact analysis and testing, thermal analysis, ground characterization tests, configuration packaging, and trajectory simulation are employed to determine the feasibility of an entirely passive Earth entry capsule for the Mars Sample Return mission. The design circumvents the potential failure modes of a parachute terminal descent system by replacing that system with passive energy abs...
Keywords: AEROSOLS; IN SITU MEASUREMENT; MODIS (RADIOMETRY); HISTOGRAMS; PUBLIC HEALTH; AIR QUALITY; AIR POLLUTION; TROPOSPHERE; EARTH SCIENCES; MONITORS; OPTICAL THICKNESS; PARTICULATES; SATELLITE OBSERVATION; DATA ACQUISITION; MULTISENSOR FUSION; REAL TIME OPERATION
Downloads: 119
[texts]Aircraft engine hot section technology: An overview of the HOST Project - Sokolowski, Daniel E.
NASA sponsored the Turbine Engine Hot Section (HOST) project to address the need for improved durability in advanced aircraft engine combustors and turbines. Analytical and experimental activities aimed at more accurate prediction of the aerothermal environment, the thermomechanical loads, the material behavior and structural responses to loads, and life predictions for cyclic high temperature operation were conducted from 1980 to 1987...
Keywords: CAMERAS; ARGON LASERS; CARBON TETRACHLORIDE; FLASH LAMPS; HELIUM-NEON LASERS; LIGHT SOURCES; MERCURY LAMPS; NEODYMIUM LASERS; PARTICULATES; PROPYLENE; RUBY LASERS; FLOW VISUALIZATION; SCHLIEREN PHOTOGRAPHY; VAPORS; LENSES; OPTICAL MEASUREMENT; OPTICAL MEASURING INSTRUMENTS; SCANNING; SUPERSONIC WIND TUNNELS; TECHNOLOGY ASSESSMENT; TRANSONIC WIND TUNNELS
Downloads: 163
[texts]An Interlaminar Tensile Strength Specimen - Martin, Roderick H.
This paper describes a technique to determine interlaminar tensile strength, sigma(sub 3c), of a fiber reinforced composite material using a curved beam. The specimen was a unidirectional curved beam, bent 90 deg, with straight arms. Attached to each arm was a hinged loading mechanism that was held by the grips of a tension testing machine. Geometry effects of the specimen, including the effects of loading arm length, inner radius, thickness, and width, were studied...
Keywords: ELECTRON BEAM WELDING; INTERNATIONAL COOPERATION; CONTAMINATION; ELECTRON BEAMS; METEORITES; ELECTRIC SPARKS; STAINLESS STEELS; TITANIUM ALLOYS; NASA PROGRAMS; SPACEBORNE EXPERIMENTS; AEROSPACE ENVIRONMENTS; UNIVERSITY PROGRAM; RESEARCH AND DEVELOPMENT; PARTICULATES; VAPOR PRESSURE; PARTICLE EMISSION; INTERNATIONAL SPACE STATION; SPACE DEBRIS
Downloads: 264
[texts]STRIPE: Remote Driving Using Limited Image Data - Kay, Jennifer S
Driving a vehicle, either directly or remotely, is an inherently visual task. When heavy fog limits visibility, we reduce our car's speed to a slow crawl, even along very familiar roads. In teleoperation systems, an operator's view is limited to images provided by one or more cameras mounted on the remote vehicle. Traditional methods of vehicle teleoperation require that a real time stream of images is transmitted from the vehicle camera to the operator control station, and the operator steers t...
Keywords: SOOT; GAS JETS; LAMINAR FLOW; LOADS (FORCES); MORPHOLOGY; PARTICULATES; SHAPES; WEIGHTLESSNESS; DIFFUSION FLAMES; JET FLOW; RADIATIVE HEAT TRANSFER; PROPULSION SYSTEM PERFORMANCE; PROPULSION SYSTEM CONFIGURATIONS; RAYLEIGH SCATTERING; SCATTERING CROSS SECTIONS; FLAME PROPAGATION
Downloads: 121
[texts]Space life sciences strategic plan, 1991 - NON
Over the last three decades the life sciences program has significantly contributed to NASA's manned and unmanned exploration of space, while acquiring new knowledge in the fields of space biology and medicine. The national and international events which have led to the development and revision of NASA strategy will significantly affect the future of life sciences programs both in scope and pace. This document serves as the basis for synthesizing the option to be pursued during the next decade, ...
Keywords: HEAT TREATMENT; ALUMINUM COMPOUNDS; DUCTILITY; HIGH TEMPERATURE TESTS; MICROSTRUCTURE; OXIDATION RESISTANCE; THERMAL EXPANSION; TITANIUM COMPOUNDS; LOW DENSITY MATERIALS; LOW TEMPERATURE TESTS; MATERIALS TESTS; METAL MATRIX COMPOSITES; PARTICULATES; REFRACTORY METALS; REINFORCING MATERIALS; WIRE
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